More physical activity was linked to lower type 2 diabetes risk, with age-related differences

News summary

Medical Xpress reported that, in UK Biobank—a large UK research resource that follows volunteers' health data over time—more moderate-to-vigorous physical activity was associated with a lower risk of developing type 2 diabetes during follow-up. The relative association appeared stronger in younger adults, while the higher baseline diabetes risk at older ages meant that the absolute number of potentially preventable cases could still be substantial in older groups. These are observational findings and do not prove that increasing activity alone caused the reduction.

Overall, more active participants had a lower risk of type 2 diabetes. The researchers also examined age-related differences: relative associations were stronger at younger ages, while absolute risk reductions could be more meaningful at older ages because diabetes incidence is higher in those groups.

The public-health message is straightforward: physical activity matters across adulthood, but the effect should be described carefully. Younger adults may show larger relative risk reductions, whereas in older adults even smaller relative differences can correspond to more cases avoided in absolute terms.

This was an observational study and cannot establish causation. Physical activity was measured during a limited device-wear period and may have changed during follow-up. Residual confounding, the selected nature of UK Biobank participants, and differences in health or lifestyle could explain part of the observed association.